Is there any better way to find the digit multiplication and summation?

问题:

int N = 2345;         var digitArray = N.ToString().ToCharArray();         int multiplicationSum = 1;         foreach (char digit in digitArray)         {             multiplicationSum = int.Parse(digit.ToString()) * multiplicationSum;         }         var sum = 0;         var sumArray = multiplicationSum.ToString().ToCharArray();         foreach (char digit in sumArray)         {             sum = int.Parse(digit.ToString()) + sum;         }

Thanks

回答1:

Assuming you don't need to deal with negative numbers, it seems doing it mathematically would make a lot more sense

int N = 2345; int multiplicationSum = 1; while(N!=0) {   multiplicationSum = multiplicationSum * (N%10);   N = N/10; } var sum = 0; while(multiplicationSum!=0) {   sum = sum + (multiplicationSum%10);   multiplicationSum = multiplicationSum/10; }

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References:

% operator

The % operator computes the remainder after dividing its first operand by its second

/ operator:

When you divide two integers, the result is always an integer. For example, the result of 7 / 3 is 2

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